def f1 (self, x, y):
	return min (x,y)
class C:
	f = f1
obj = C ()
print obj.f (2,4)
class Saco:
	def __init__(self):
		self.data = []
	def add (self, x):
		self.data.append (x)
	def add2 (self, x):
		self.add (x)
		self.add (x)
obj = Saco ()
obj.add2 ("arroz")
print obj.data
